roll of tobacco vs tobacco

roll of tobacco and tobacco both are nouns.

Word	Noun	Adjective	Verb	Adverb
roll of tobacco	Yes	No	No	No
tobacco	Yes	No	No	No

As nouns, tobacco is a hypernym of roll of tobacco; that is, tobacco is a word with a broader meaning than roll of tobacco:

roll of tobacco: tobacco leaves that have been made into a cylinder
tobacco: leaves of the tobacco plant dried and prepared for smoking or ingestion

Other hypernyms of roll of tobacco include baccy.

roll of tobacco (noun)	tobacco (noun)
tobacco leaves that have been made into a cylinder	leaves of the tobacco plant dried and prepared for smoking or ingestion
	aromatic annual or perennial herbs and shrubs